JonC Posted February 20 Author Share Posted February 20 31 minutes ago, Gordmac said: A pump doesn't provide pressure it provides flow. You don't want one that becomes a restriction at high flow requirements. Yes, I get what you are saying, this is why I haven’t done it until now.The pump has a flow rate of about 70lts per hour so it should deliver enough fuel. I’m hoping that the little bit of extra pressure will help to purge any air out of my system which I suspect is my problem. It may also help to find the leak Quote Link to comment Share on other sites More sharing options...
GPSguru Posted February 20 Share Posted February 20 1 hour ago, JonC said: Yes, I get what you are saying, this is why I haven’t done it until now.The pump has a flow rate of about 70lts per hour so it should deliver enough fuel. I’m hoping that the little bit of extra pressure will help to purge any air out of my system which I suspect is my problem. It may also help to find the leak Any air leak can only be between the tank and HP pump. As fuel is drawn through the system by the HP pump it creates a slight vacuum, which tends to draw in air from any improper seal, however the same seal might not allow fuel to escape ! The air mixes with the fuel, which is ok when the engine is running, however, when the engine stops, the air very slowly migrates from the fuel as minute bubbles to the highest point in the fuel system, which is normally the injector fuel rail. daio web 1 Quote Link to comment Share on other sites More sharing options...
suzook12 Posted February 21 Share Posted February 21 On 2/20/2024 at 1:16 PM, JonC said: Yes, I get what you are saying, this is why I haven’t done it until now.The pump has a flow rate of about 70lts per hour so it should deliver enough fuel. I’m hoping that the little bit of extra pressure will help to purge any air out of my system which I suspect is my problem. It may also help to find the leak Regards air, I believe air gets trapped in the HP pump where it struggles to deal with it. A LP pump helps push any air into the rail where it can be pushed through the electronically fired injectors. We will know soon enough if that is the problem 👍 Quote Link to comment Share on other sites More sharing options...
JonC Posted February 21 Author Share Posted February 21 52 minutes ago, suzook12 said: Regards air, I believe air gets trapped in the HP pump where it struggles to deal with it. A LP pump helps push any air into the rail where it can be pushed through the electronically fired injectors. We will know soon enough if that is the problem 👍 I don’t think I have a fuel rail, I have 5 pipes coming from the hp pump, each to an injector? Quote Link to comment Share on other sites More sharing options...
GPSguru Posted February 21 Share Posted February 21 52 minutes ago, suzook12 said: Regards air, I believe air gets trapped in the HP pump where it struggles to deal with it. A LP pump helps push any air into the rail where it can be pushed through the electronically fired injectors. We will know soon enough if that is the problem 👍 On most of the older diesels, if the filter housing ( often called the secondary filter) is not a perfect seal then it draws air as the fuel pressure in the filter drops to below one atmosphere when the engine is running. many engines only have one filter, but it is still often referred to as the secondary filter because the element is 3 microns, whereas all primary filters are 30 micron elements. I had this issue with the jeep, no obvious leak, and a permanent problem of air in the fuel rail causing extended cranking, with the obvious grey white smoke as it started and burnt off the excess fuel. I rebuilt the fuel housing which improved the issue, but didn't fix it, so I bit the bullet and got a new housing (very expensive), which fixed the issue completely. TBF the engineers at VM specialists, helped me over the phone in diagnosing the problem, top guys at their profession 👍, they even told who to get the new housing from. Speaking to my mate who owns a garage, in the past they have spent many hours trying to solve air fuel issues in euro 4 and earlier engines. A lot of the later stuff (5/6) is self bleed and doesn't seem to suffer the same issues. Quote Link to comment Share on other sites More sharing options...
JonC Posted February 21 Author Share Posted February 21 5 minutes ago, GPSguru said: On most of the older diesels, if the filter housing ( often called the secondary filter) is not a perfect seal then it draws air as the fuel pressure in the filter drops to below one atmosphere when the engine is running. many engines only have one filter, but it is still often referred to as the secondary filter because the element is 3 microns, whereas all primary filters are 30 micron elements. I had this issue with the jeep, no obvious leak, and a permanent problem of air in the fuel rail causing extended cranking, with the obvious grey white smoke as it started and burnt off the excess fuel. I rebuilt the fuel housing which improved the issue, but didn't fix it, so I bit the bullet and got a new housing (very expensive), which fixed the issue completely. TBF the engineers at VM specialists, helped me over the phone in diagnosing the problem, top guys at their profession 👍, they even told who to get the new housing from. Speaking to my mate who owns a garage, in the past they have spent many hours trying to solve air fuel issues in euro 4 and earlier engines. A lot of the later stuff (5/6) is self bleed and doesn't seem to suffer the same issues. I drove my 200tdi defender for about 100 miles without a bleed off pipe banjo fitting o problems at all. That engine starts on the first flick with one blast of glow plugs regardless of weather even after standing for a month. Quote Link to comment Share on other sites More sharing options...
GPSguru Posted February 21 Share Posted February 21 4 hours ago, JonC said: I drove my 200tdi defender for about 100 miles without a bleed off pipe banjo fitting o problems at all. That engine starts on the first flick with one blast of glow plugs regardless of weather even after standing for a month. Yep, the 200 was quite a resilient engine with regard to fuel pressure and injector timing. However, the 300 is very well known for the air leak like I described above from the fuel filter housing, and the result is a no start. Quote Link to comment Share on other sites More sharing options...
GPSguru Posted February 22 Share Posted February 22 22 hours ago, JonC said: drove my 200tdi defender You still got the 200tdi ? unfortunately engine parts for the 200 are getting very scarce, I think Turners may have a few reman items, but a ton of stuff is no longer available, which is a shame as it was one of LR’s toughest engines. Quote Link to comment Share on other sites More sharing options...
JonC Posted February 22 Author Share Posted February 22 2 hours ago, GPSguru said: You still got the 200tdi ? unfortunately engine parts for the 200 are getting very scarce, I think Turners may have a few reman items, but a ton of stuff is no longer available, which is a shame as it was one of LR’s toughest engines. Yes, it’s still on the road but I don’t use it much now as I have a car that I use to run around in. It’s always nice to have it though just in case I get the urge to fix something. Quote Link to comment Share on other sites More sharing options...
GPSguru Posted February 23 Share Posted February 23 15 hours ago, JonC said: It’s always nice to have it though just in case I get the urge to fix something. You got a boat for that ! Quote Link to comment Share on other sites More sharing options...
Saintly Fish Posted February 23 Share Posted February 23 5 hours ago, GPSguru said: You got a boat for that ! You underestimate just how much @JonC loves having problems to fix and throw money at!! Quote Link to comment Share on other sites More sharing options...
GPSguru Posted February 23 Share Posted February 23 5 hours ago, Saintly Fish said: You underestimate just how much @JonC loves having problems to fix and throw money at!! Nah, @JonC is a lot like all of us old school, you keep on going until you fix the issue, and in doing so you learn a lot, every day is a school day 👍 daio web 1 Quote Link to comment Share on other sites More sharing options...
daio web Posted February 25 Share Posted February 25 On 2/23/2024 at 11:00 PM, GPSguru said: Nah, @JonC is a lot like all of us old school, you keep on going until you fix the issue, and in doing so you learn a lot, every day is a school day 👍 thats exactly right like i always say to my mates there aint no service staitions out the you need to know as much as you can about engines as soon as i get 5 i will do a update on my work done to the boat so far Andy135, Geoff, captin slows old outlaw and 1 other 4 Quote Link to comment Share on other sites More sharing options...
Saintly Fish Posted March 4 Share Posted March 4 So how much more money have you waisted this week Jon? Quote Link to comment Share on other sites More sharing options...
JonC Posted March 4 Author Share Posted March 4 I haven’t had chance to get near it, except for an hour yesterday evening. I’ve been busy ripping out that rat infested shit pit. Saintly Fish 1 Quote Link to comment Share on other sites More sharing options...
GPSguru Posted March 15 Share Posted March 15 On 3/4/2024 at 6:30 PM, JonC said: I haven’t had chance to get near it, except for an hour yesterday evening. I’ve been busy ripping out that rat infested shit pit. Done anymore on it yet ? Quote Link to comment Share on other sites More sharing options...
JonC Posted March 15 Author Share Posted March 15 8 hours ago, GPSguru said: Done anymore on it yet ? No, I’ve been too busy at work and doing renovations to even get near it.☹️ Quote Link to comment Share on other sites More sharing options...
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